FFX® is a medical device intended to prevent spinal instability and facet motion by enabling lumbar facet joint arthrodesis consecutive to the surgical treatment of degenerative narrow lumbar canal or facet syndrome. DIVA® is a medical device intended to maintain intervertebral height consecutive to surgical lumbar discectomy. Class IIb medical devices, CE0459, manufactured by SC MEDICA, covered under Article L 165-1 of the French Social Security Code. Carefully read the instructions for use.